Fix test for wait option

Author: ildus

Diff for: testgres/node.py

@@ -570,7 +570,7 @@ def start(self, params=[], wait=True):
 
         Args:
             params: additional arguments for pg_ctl.
-            wait: wait until operation completes
+            wait: wait until operation completes.
 
         Returns:
             This instance of :class:`.PostgresNode`.
@@ -601,7 +601,7 @@ def stop(self, params=[], wait=True):
 
         Args:
             params: additional arguments for pg_ctl.
-            wait: wait until operation completes
+            wait: wait until operation completes.
 
         Returns:
             This instance of :class:`.PostgresNode`.

Diff for: tests/test_simple.py

@@ -376,7 +376,15 @@ def test_backup_wrong_xlog_method(self):
     def test_pg_ctl_wait_option(self):
         with get_new_node() as node:
             node.init().start(wait=False)
-            node.stop(wait=False)
+            while True:
+                try:
+                    node.stop(wait=False)
+                except ExecUtilException:
+                    # it's ok to break here since node could be not
+                    # started yet
+                    continue
+                else:
+                    break
 
     def test_replicate(self):
         with get_new_node() as node: